<template>
  <view>
    <MySearch @click="gotoSearch"></MySearch>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view
        class="left-scroll-view"
        scroll-y
        :style="{ height: wh + 'px' }"
      >
        <block v-for="(item,i) in cateList" :key="item.cat_id">
          <view :class="['left-scroll-view-item',i === active ? 'active':'']" @click="changeActive(i)">{{item.cat_name}}</view> 
        </block>
      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view
        class="right-scroll-view"
        scroll-y
        :style="{ height: wh + 'px' }"
        :scroll-top="scrollTop"
      >
        <view class="right-scroll-view-item" v-for="(item2,i) in cateList2" :key="item2.cat_id">
          <view class="right-scroll-view-title">
            /{{item2.cat_name}}/
          </view>
          <!-- 动态渲染三级分类的列表数据 -->
          <view class="cate-lv3-list">
            <!-- 三级分类 Item 项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="item3.cat_id" @click="gotoCoodsList(item3)">
              <!-- 图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      wh: 0,
      cateList:[],
      active:0,
      cateList2:[],
      scrollTop:0
    };
  },
  onLoad() {
    const sysInfo = uni.getSystemInfoSync();
    console.log(sysInfo);
    this.wh = sysInfo.windowHeight - 50;
    this.getCateList();
  },
  methods:{
    async getCateList(){
      let res = await uni.$http.get("/api/public/v1/categories")
      console.log(res);
      if(res.statusCode == 200){
        this.cateList = res.data.message
        this.cateList2 = res.data.message[0].children
      }
    },
    changeActive(i){
      this.active = i
      // 为二级分类赋值
      this.cateList2 = this.cateList[i].children
      this.scrollTop = this.scrollTop == 0 ? 1:0
    },
    gotoCoodsList(item){
      console.log(item);
      uni.navigateTo({
        url:'/subpkg/goods_list/index?cid=' + item.cat_id
      })
    },
     // 跳转到分包中的搜索页面
    gotoSearch() {
      uni.navigateTo({
        url: "/subpkg/search/index",
      });
    },
  }
};
</script>

<style>
.scroll-view-container {
  display: flex;
}
.left-scroll-view {
  width: 120px;
}
.left-scroll-view-item {
  line-height: 60px;
  background-color: #f7f7f7;
  text-align: center;
  font-size: 12px;
}
// 激活项的样式
.active {
  background-color: #ffffff;
  position: relative;
}
// 渲染激活项左侧的红色指示边线
.left-scroll-view-item::before {
  content: " ";
  display: block;
  width: 3px;
  height: 30px;
  background-color: #1296db;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
}
.right-scroll-view-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
}
.cate-lv3-item {
  width: 33.33%;
  margin-bottom: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
image {
  width: 60px;
  height: 60px;
}

text {
  font-size: 12px;
}
</style>